Two species of fungi (Armillaria mellea and Epulorhiza sp.) affecting the growths, developments and active components of their hosts, were studied by the methods of chemistry, physiology, biochemistry and analytical chemistry. The three portions of research thesis included studies on chemical constituents of Armillaria mellea and their effects on the mycelium growth and the effective components of Polyporus umbellatus, the effects of A. mellea metabolites on Gastrodia elata seed germination and develo...